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1 package org.apache.turbine.services.localization; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache Turbine" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache Turbine", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 import java.util.Locale; 58 import java.util.StringTokenizer; 59 import org.apache.turbine.services.resources.TurbineResources; 60 import org.apache.turbine.util.RunData; 61 62 /*** 63 * This class returns a Locale object based on the HTTP 64 * Accept-Language header. 65 * 66 * This class is based on examples from Jason Hunter's book <i>Java 67 * Servlet Programming</i>. 68 * 69 * @author <a href="mailto:frank.kim@clearink.com">Frank Y. Kim</a> 70 * @author <a href="mailto:jon@collab.net">Jon S. Stevens</a> 71 * @deprecated Use LocaleTokenizer instead. 72 */ 73 public class LocaleDetector 74 { 75 /*** 76 * Attempts to pull the "Accept-Language" header out of the 77 * HttpServletRequest object and then parse it. If the header is 78 * not present, it will return a null Locale. 79 * 80 * @param data Turbine information. 81 * @return A Locale. 82 */ 83 public static Locale getLocale(RunData data) 84 { 85 String header = data.getRequest().getHeader("Accept-Language"); 86 if ( header == null || header.length() == 0 ) 87 return null; 88 return getLocale( header ); 89 } 90 91 /*** 92 * This method parses the Accept-Language header and attempts to 93 * create a Locale out of it. 94 * 95 * @param languageHeader A String with the language header. 96 * @return A Locale. 97 */ 98 public static Locale getLocale(String languageHeader) 99 { 100 Locale locale = null; 101 102 // return a "default" locale 103 if ( languageHeader == null || 104 languageHeader.trim().equals("") ) 105 { 106 return new Locale( 107 TurbineResources.getString("locale.default.language", "en"), 108 TurbineResources.getString("locale.default.country", "US")); 109 } 110 111 // The HTTP Accept-Header is something like 112 // 113 // "en, es;q=0.8, zh-TW;q=0.1" 114 StringTokenizer tokenizer = new StringTokenizer(languageHeader, ","); 115 116 // while ( tokenizer.hasMoreTokens() ) 117 // { 118 String language = tokenizer.nextToken(); 119 // This should never be true but just in case 120 // if ( !language.trim().equals("") ) 121 return getLocaleForLanguage(language.trim()); 122 // } 123 } 124 125 /*** 126 * This method creates a Locale from the language. 127 * 128 * @param language A String with the language. 129 * @return A Locale. 130 */ 131 private static Locale getLocaleForLanguage(String language) 132 { 133 Locale locale; 134 int semi, dash; 135 136 // Cut off any q-value that comes after a semicolon. 137 if ( (semi=language.indexOf(';')) != -1 ) 138 { 139 language = language.substring(0, semi); 140 } 141 142 language = language.trim(); 143 144 // Create a Locale from the language. A dash may separate the 145 // language from the country. 146 if ( (dash=language.indexOf('-')) == -1 ) 147 { 148 // No dash means no country. 149 locale = new Locale(language, ""); 150 } 151 else 152 { 153 locale = new Locale(language.substring(0, dash), 154 language.substring(dash+1)); 155 } 156 157 return locale; 158 } 159 }

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